Cover for mobile phone battery



FIG. 1 is a perspective view of a cover for mobile phone battery showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top plan view thereof where the bottom plan view is a mirror image.

In the drawings, the broken lines depict unclaimed environment. 

CLAIM The ornamental design for a cover for mobile phone battery, as shown and described. 